Machine for dressing millstones



2 Sheets-Sheet 1 (Modelr) P. M. HAAS Maohine for Dressing Millstones. No. 228,630.

Patented June 8,1880;

mirms. Puorb-muoemmea, WASHINGTON. n. c

(ModL) I 2 Sheets-Sheet 2 P. M. H-AAS. Machine for Dressing Millstones. No. 228,630. Patented-June 8,1880.

N. PETERS. PNOTCLUYHOGRAHIER, WASHINGTON, l5. 0.

UNITED STATES PATENT ()Frrcno PHILIP MVHAAS, OF WARREN, OHIO.-

MACI -I INE FOR DRESSING MILLSTONES.

SPECIFICATION forming part of Letters Patent No. 228,630, dated June 8, 1880.

Application filed April 6, 1880.

To all whom it may concern:

Be it known that I, PHILIP MELANCTHON HAAS, acitizen of the United States, residing at Warren, in the county of Trumbull, in the State of Ohio, have invented new and useful Improvements in Machines for Dressing Millstones, of which the following is a specification.

In a patentgranted to me January 21, 1879, for improvements in millstone-dressers, a pivoted frame carrying the dressing-toolis adapted for use in connection with a segmental guide, which serves as a sweep for said pivoted frame, and a chase-ring, which serves as the means upon which the segmental guide and said pivoted frame may be adjusted over the face of the stone, as may be required to make the desired dress or furrows; and my present invention embraces improvements in the mi1lstone-dresser, by which such combination is made more advantageous and to effect more satisfactory results.

To render the machine more compact, free from jar, carrying the adjustable bed-frame which supports the cutting-tool slide in close proximity to the surface of the stone, to provide means for elfecting and maintaining a true level of the operating parts with the face of the stone, and to practically support the tool-carryin g parts independent of the stone in making the dress, are the primary objects of my improvements.

I attain these objects by the apparatus illustrated in the accompanying drawings, in which- Figure 1 represents a top view of the apparatus; Fig. 2, a vertical section taken lengthwise through the pivoted frame; Fig. 3, a side view, looking at the end of said pivoted frame; Fig. 4, a cross-section of said pivoted frame, and Fig. 5 a horizontal section through that part of said frame which supports the adjustable bed-frame of the dresser-slide near the face of the stone.

The machine described in my said patent is adapted for use independent of the stone as a means for effecting a true facing and dressing, while by my said improvements the machine is supported for use upon the stone and the dressing is practically effected independent of the face of the stone.

(ModeL) A metallic frame supports the operating parts; and it consists of a stout ring, A, provided with three equidistant circumferential projections, b, which serve as means for the attachment of legs 0, which rest upon the surface of the stone. The ring serves as achasering for a rotary frame, which carries the pivoted frame within and by which thedressingtool is supported and adjusted. This rotary frame consists of a metallic ring, B, provided with a continuous top circumferential rim, d, and a segmental guide, D, within and across this ring and concentric with the swiveling pivot of the frame which governs the line of travel of the diamond. This rotary ring fits closely within the chase-ring, and the circumferential rim (1, restin g upon the chase-ring, supports the operating parts, while the segmental guide serves to allow of the adj ustmeut of the pivoted frame in relation to the furrows to be out. It is important that these two rings should be exactly surfaced and made true, so that the inner or rotary one will always be level, and this I effect by grinding the joining surfaces of these rings with emerypowder while so joined, so that the inner ring will maintain a true relation at every point with the chase-ring, and in which the joining parts will be covered and protected from dust.

The pivoted frame is arranged beneath the rings, and consists of an arm, E, connected at its outer end by a pivot, c, to the under side of the rotary ring, and two depending brackets or hangers, E, standing on each side of and just in rear of the pivot a, so as to bring them beneath the rings. Upon the pivot c this frame may be turned to the right or to the left, while a screw, f, rising from its inner end and passing through the segmental guide D, serves to clamp the said frame in whatever position it may be adjusted, to cut the furrow in the desired line. The arm E crosses the center of the rings and looks with the segmental guide or sweep at a point within the revolving ring on that side of its center away from the pivot.

The brackets or hangers E extend to near the surface of the stone, but are always free therefrom, and they serve the important purpose of supporting the adjustable bed-frame F low down or near the surface of the stone,

and therefore support the diamond-slide in the same relation to the stone, which gives very great advantage in a firm and better handling of the diamond. For this purpose the brackets or hangers are formed with inwardprojectin g rests or ledges, g, at their lower ends, upon which the adjustable bed-frame is placed in position between them and removably secured, so that it extends beyond the rings. Upon this bed-frame the cutter-head or diamond-carrying slide I is fitted in ways, so as to be moved in the direction of the pivoted frame to cut the furrow. This bed-frame is held firmly in whatever position it may be adjusted upon the bracket-ledges by set-screws h, carried in the upper curved ends of arms J, pivoted to each end of the hangers below and outside of said frame, in such manner that when turned in the screws will stand over and be clamped upon said frame at each side, and when the screws are unclamped and the pivoted arms turned out, as shown by dotted lines in Fig. 3, the bed-frame, with its cutter head or slide, can be removed when desired. This bed-frame has capacity for adjustment in its longitudinal plane, by which the diamond will cut the furrow with a varying longitudinal depth, by means of supplemental ledges or rests g, placed upon the bracket-ledges g, and by raising the outer ends of these upper ledges and inserting some piece, g of the required thickness beneath them they will thereby have a slant (see dotted lines 9 Fig. 2) toward the eye of the stone, and the bed-frame will be correspondingly inclined, so that the diamond, as it is moved toward the center, will increase the depth of the furrow. These supplemental ledges are secured by screws, so that they can be readily adjusted.

The bed-frame has also capacity for adjustment in its transverse plane, to cut from the bottom of the furrow out to the land-surface by means of screws 2', which, passing through one side of said frame, bear upon the supplemental ledges g, and thus incline the frame crosswise, so that the cross-feed of the diamond will give the proper inclined dress to the furrows. Means for effecting this lateral feed are not shown but they maybe such as described and shown in my said patent, or any suitable means. These adjusting-screws may be used in either side of the bed-frame, so as to change the incline of the furrow to suit either a right or left dressed stone.

The legs are provided with separate rests c, secured by screws, and by inserting some thin piece or article, 0 between the rest and the plate of the foot, any variation in the length of the leg or legs is thus compensated for and a firm and broad support obtained.

The diamond-holding stem I have not shown 5 but it is adapted for vertical adjustment, and to be held firmly in position in any suitable way. The machine being properly adjusted upon the stone, the diamond or cutting-toolis set to make the required depth of cut, and the of the machine is then changed so that the.

legs rest upon the dressed surface. The diamond is then adjusted so as to properly finish the dress.

It will be noticed that the rings are of much less diameter than the stone, and are supported so that warping and springing are prevented; that the diamond-carrying slide is supported low down and firmly sustained in aposition to allow the operator to work beneath the rings, and to give a firm support to the cutting-tool outside of the rings, so as to cut from the eircumference to the eye of the stone; that the machineis of compact and simple structure, giving the cutting-tool afirm action and every facility for convenient work.

The foot-rests of the legs give a broad, and solid support, and afford means for leveling the rings without supporting any part of the machine upon adjusting-screws.

The bed-frame is not only clamped upon the depending brackets at four points, but is supported between them so that the position of said frame, when in use, will be centrally, or nearly so, beneath the pivot of the frame which carries it, and it is this arrangement and construction which gives the advantage of firmly supporting this bed-frame outside of the rings and freedom for the operator to work beneath the chase-rin g and practically beneath the pivoted frame.

In all matters relating to the complete preparation and finishing of the stone the skilled operator will understand what adj ustmeuts the diamond will be necessary and what of preliminary and finishing operations to make.

The rotary frame is suitably braced by interior webbing, and it is moved around upon the chase-ring as each furrow is out, while the pivoted frame can be changed from one side of the center web-rib, B, to the other, as may be required, to change the sweeping action of said pivoted frame for a right or left dress.

It will be understood that the stone is first put in perfect face before commencing to cut the furrows. A

I claim- 1. The combination, in amachine for dressin g millstones, of the chase-ring provided with the circumferential projections b, for the supporting-legs, the rotary ring provided with a continuous bearing-rim, d, and segmental guide D, with the pivoted frame arranged on the under side of said rings, whereby to support and carry the dressing-tool, substantially as and for the purpose herein set forth.

2. The pivoted framehavingits pivotal point on the under side of the rotary frame, and provided with depending brackets or sides formed with bottom ledges or rests, in combination with the bed-frame carrying the dressing-tool slide, and the clamping and holding arms pivoted to said brackets, whereby said bed-frame is firmly clamped in position near the face of the stone and-beneath and extending outside of the rings, substantially as and for the purpose herein set forth.

3. In a machine for dressing millstones, the combination of the pivoted frame having the ledge-supporting brackets with the bed-frame F, the pivoted clampin g-arms therefor, and the supplemental adjustable ledges or rests g, interposed between said frame and the bracketledges, substantially as and for the purpose herein set forth.

4. The bed-frame F, removably secured between the depending brackets E and upon bottom ledges, g, thereon, and provided with the set-screws c 2', whereby to effect the crosswise adjustment of the plane of said frame, for the purpose set forth.

6. A machine for dressing millstones, consisting of the chase-ring provided with the circumferential projections and the support ing-le'gs, the rotary rim provided with the continuous bearing-ring and the segmental guide, the pivoted frame provided with the depending brackets, the bottom ledges or rests, and the pivoted clamping-arms, and the bedframe supported upon and between said brackets and beneath the rings, the several parts being constructed and arranged for operation substantially as herein set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

PHILIP M. HAAS.

Witnesses J. B. BLACKBURN, E. W. MOORE. 

